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Decision formation in parietal cortex transcends a fixed frame of reference.

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Summary

Neurons in the lateral intraparietal cortex (LIP) represent decisions linked to actions. Even when actions disrupt single neurons, neural ensembles maintain decision continuity by transferring information, generalizing decisions across actions.

Keywords:
decision-makingframe of referencemulti-neuron recordingparietal cortexpopulation coderemappingsensori-motor coordinationworking memory

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Area of Science:

  • Neuroscience
  • Cognitive Neuroscience
  • Decision Making

Background:

  • Neurons in the lateral intraparietal cortex (LIP) are known to represent decisions tied to specific actions, like eye movements.
  • This representation is thought to be limited when actions disrupt the direct linkage between the decision and the neural representation.

Purpose of the Study:

  • To investigate how the brain represents decisions that span across actions, potentially disrupting the direct action-selection linkage.
  • To determine if neural ensembles can maintain the continuity of a decision process despite intervening actions.

Main Methods:

  • Simultaneous multi-neuron recordings were conducted in two rhesus monkeys during a decision-making task.
  • Analysis focused on how neural activity represented the decision process across different action phases.

Main Results:

  • While individual neurons showed disrupted decision representations following intervening actions, the collective activity of neural ensembles maintained continuity.
  • Information was effectively passed between sequentially active neurons, preserving the evolving decision representation.
  • This ensemble mechanism allowed decisions to be generalized across actions, transcending fixed reference frames.

Conclusions:

  • Neural ensembles in LIP can maintain a continuous representation of a decision, even when actions interrupt the direct link to a specific motor output.
  • This finding extends the concept of neural remapping from perceptual stability to the continuity of cognitive processes like decision-making.
  • The brain employs a dynamic information transfer mechanism within neural populations to support flexible and ongoing thought processes.